Question

If a shop is open from 9:30 am to 10 pm, how long is it open?

Answer 1

Here, 10 pm in 24 hours clock is 22:00

9.30 am in 24 hours clock is 09:30

Hours	Minutes
2 2	0 0	Shop closes
-  9	3 0	Shop opens
1 2	3 0

∴ The shop opens for 12 hours 30 minutes.